Search

The cross-instrumental dating of the Quaternary deposits in the Sambia (Kaliningrad) Peninsula has made it possible to obtain a time series that indicates the formation of a sequence overlapping the Last Glaciation deposits in the Late Holocene under subaerial conditions with active aeolian accumulation starting from 450–400 BP. The earlier established fluvioglacial genesis and Late Glacial age of the surface deposits need to be revised. Greater aeolian activity is presumably related to climate changes during the Little Ice Age. OSL dating of very young (Late Holocene) subaerial deposits demonstrates the reliable results supported by agreement with the radiocarbon analysis data and the stratigraphic position of the dated sequences. [ABSTRACT FROM AUTHOR]

The paper presents new lithological, geochronological, and biostratigraphic data on the studied sections of the Middle Valdai interstadial sediments in the sections of two terraces in the basin of the Severnaya Dvina River and on the southern coast of the Kola Region and in its southwestern part. The obtained data are correlated with the data available for other regions of northeastern Europe. The Severnaya Dvina River was found to have flowed into a marine reservoir existed in the White Sea basin throughout the Middle Valdai time corresponding to Marine Isotopic Stage 3 (MIS 3). The alluvial sedimentation in the river catchment area occurred in the environment of base level instability and permanently changing climate. In northeastern Europe, the warmest (optimum) intervals are related to the time spans of 47-43 and 31.3-29.2 cal. ka BP. In general, the available data point to 12 warming and cooling episodes in northeastern Europe. [ABSTRACT FROM AUTHOR]

From the viewpoint of precision and reliability of radioisotopic dating, deposits whose quantitative age can be determined through several methods of geochronometry are of special interest. The mutually conforming finite C and Th/U dates of buried Neopleistocene organic deposits, taken from the Tolokonka section by the North Dvina River (100 km downstream from the city of Kotlas), have been obtained for the first time in Russia. The stratigraphical reference of these results to those obtained via the optically induced luminescence for upper and lower bedding layers has been established. The presented geochronometric data have allowed us to consider the age of oxbow lake organic deposits completely reliable and refer the time of their formation to the Tyrbei warming within the MIS-3. The applicability of the new version of the Th/U method for dating of interglacial and interstadial deposits, for the purpose of solving the Middle and Late Neopleistocene chronostratigraphy issues, is confirmed. [ABSTRACT FROM AUTHOR]